springboot+mybatis-plus 代码生成器 CRUD 分页插件

1 添加mybatis-plus相关依赖

    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-boot-starter</artifactId>
        <version>3.1.1</version>
    </dependency>
    <!-- 自动生成代码 -->
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-generator</artifactId>
        <version>3.1.1</version>
    </dependency>
    <!-- 模板引擎 -->
    <dependency>
        <groupId>org.apache.velocity</groupId>
        <artifactId>velocity-engine-core</artifactId>
        <version>2.1</version>
    </dependency>
    <!-- lombok -->
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.16.10</version>
    </dependency>

2 配置application.properties

#编码格式
#server.tomcat.uri-encoding=utf-8
#数据库相关配置
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/orcl?serverTimezone=UTC&useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false

spring.datasource.username=root
spring.datasource.password=
spring.datasource.max-idle=10
spring.datasource.max-wait=10000
spring.datasource.min-idle=5
spring.datasource.initial-size=5

3.生成代码类（可自动生成entity、controller、service、mapper）
public class CodeGenerator {

/**
 * <p>
 * 读取控制台内容
 * </p>
 */
public static String scanner(String tip) {
    Scanner scanner = new Scanner(System.in);
    StringBuilder help = new StringBuilder();
    help.append("请输入" + tip + "：");
    System.out.println(help.toString());
    if (scanner.hasNext()) {
        String ipt = scanner.next();
        if (StringUtils.isNotEmpty(ipt)) {
            return ipt;
        }
    }
    throw new MybatisPlusException("请输入正确的" + tip + "！");
}

public static void main(String[] args) {
    // 代码生成器
    AutoGenerator mpg = new AutoGenerator();

    // 全局配置
    GlobalConfig gc = new GlobalConfig();
    String projectPath = System.getProperty("user.dir");
    gc.setOutputDir(projectPath + "/src/main/java");
    gc.setAuthor("lane");
    gc.setOpen(false);
    // gc.setSwagger2(true); 实体属性 Swagger2 注解
    mpg.setGlobalConfig(gc);

    // 数据源配置
    DataSourceConfig dsc = new DataSourceConfig();
    dsc.setUrl("jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC&userUnicode=true&characterEncoding=utf-8");
    // dsc.setSchemaName("public");
    dsc.setDriverName("com.mysql.cj.jdbc.Driver");
    dsc.setUsername(" ");
    dsc.setPassword(" ");
    mpg.setDataSource(dsc);

    // 包配置
    PackageConfig pc = new PackageConfig();
    pc.setModuleName(scanner("模块名"));
    pc.setParent("com");
    mpg.setPackageInfo(pc);

    // 自定义配置
    InjectionConfig cfg = new InjectionConfig() {
        @Override
        public void initMap() {
            // to do nothing
        }
    };


    // 如果模板引擎是 velocity
    String templatePath = "/templates/mapper.xml.vm";

    // 自定义输出配置
    List<FileOutConfig> focList = new ArrayList<>();
    // 自定义配置会被优先输出
    focList.add(new FileOutConfig(templatePath) {
        @Override
        public String outputFile(TableInfo tableInfo) {
            // 自定义输出文件名 ， 如果你 Entity 设置了前后缀、此处注意 xml 的名称会跟着发生变化！！
            return projectPath + "/src/main/java/com/" + pc.getModuleName()+"/mapper"
                    + "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
        }
    });
    /*
    cfg.setFileCreate(new IFileCreate() {
        @Override
        public boolean isCreate(ConfigBuilder configBuilder, FileType fileType, String filePath) {
            // 判断自定义文件夹是否需要创建
            checkDir("调用默认方法创建的目录");
            return false;
        }
    });
    */
    cfg.setFileOutConfigList(focList);
    mpg.setCfg(cfg);

    // 配置模板
    TemplateConfig templateConfig = new TemplateConfig();

    // 配置自定义输出模板
    //指定自定义模板路径，注意不要带上.ftl/.vm, 会根据使用的模板引擎自动识别
    // templateConfig.setEntity("templates/entity2.java");
    // templateConfig.setService();
    // templateConfig.setController();

    templateConfig.setXml(null);
    mpg.setTemplate(templateConfig);

    // 策略配置
    StrategyConfig strategy = new StrategyConfig();
    strategy.setNaming(NamingStrategy.underline_to_camel);
    strategy.setColumnNaming(NamingStrategy.underline_to_camel);
    //  strategy.setSuperEntityClass("你自己的父类实体,没有就不用设置!");
    strategy.setEntityLombokModel(true);
    strategy.setRestControllerStyle(true);
    // 公共父类
    //strategy.setSuperControllerClass("你自己的父类控制器,没有就不用设置!");
    // 写于父类中的公共字段
    //strategy.setSuperEntityColumns("id");
    strategy.setInclude(scanner("表名，多个英文逗号分割").split(","));
    strategy.setControllerMappingHyphenStyle(true);
    strategy.setTablePrefix(pc.getModuleName() + "_");
    mpg.setStrategy(strategy);
    //mpg.setTemplateEngine(new FreemarkerTemplateEngine());
    mpg.execute();
}

}

4.分页插件配置

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;

@Configuration
public class MybatisPlusConfig{
/**
* 分页插件
*/
@Bean
public PaginationInterceptor paginationInterceptor() {
return new PaginationInterceptor();
}
}

5.实现CRUD

@RestController
@RequestMapping("/orcl/user")

public class UserController {
@Resource
private UserMapper userMapper;

@Autowired
private IUserService userService;


//添加
@RequestMapping("/add/{id}/{name}/{pwd}")
public String add(@PathVariable("id") int id,@PathVariable("name") String name,@PathVariable("pwd") String pwd)
{
    User user=new User(id,name,pwd);
    userService.save(user);
    return "添加成功";
}


//删除
@RequestMapping("/delete/{id}")
public String delete(@PathVariable("id") int id) {
    userService.removeById(id);
    return "删除成功";
}

//修改
@RequestMapping("/update/{id}/{name}/{pwd}")
public String update(@PathVariable("id") int id,@PathVariable("name") String name,@PathVariable("pwd") String pwd)
{
    User user=new User(id,name,pwd);
    userService.updateById(user);
    return "更新成功";
}

//查询
@RequestMapping("/queryListById/{id}")
public User queryListById(@PathVariable("id") int id)
{
    User user=userService.getById(id);
    return user;
}

//分页查询
@RequestMapping("/page/{current}/{size}")
public List<User> queryPage(@PathVariable("current") int current,@PathVariable("size") int size)
{

    Map<String,Object> map = new HashMap<>();
    QueryWrapper<User> queryWrapper =  new QueryWrapper<>();
    queryWrapper.orderByDesc("id");//按id降序
    Page<User> page = new Page<>(current,size);  // 查询第current页，每页大小为size
    IPage<User> iPage = userMapper.selectPage(page,queryWrapper);
    return iPage.getRecords();
}

}